What application do you need the tester for? Manufacturing or routine testing? Testing of large volumes of the same type or one-off tests after repair? Is the time taken to perform tests a priority? Do you need something that interfaces with an asset database? Do you need to store a large numebr of test-results in the tester then download later or be able to printout after each test has been completed? Is the tester going to be used in the field or in a workshop environment? What level of accuracy is required in the measurements?